From f2edbb6699b0bc6e4f789846b99007200546c6c2 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 10 Oct 2019 15:55:33 +0530 Subject: [PATCH 1/8] opp: of: drop incorrect lockdep_assert_held() _find_opp_of_np() doesn't traverse the list of OPP tables but instead just the entries within an OPP table and so only requires to lock the OPP table itself. The lockdep_assert_held() was added there by mistake and isn't really required. Fixes: 5d6d106fa455 ("OPP: Populate required opp tables from "required-opps" property") Cc: v5.0+ # v5.0+ Reported-by: Niklas Cassel Signed-off-by: Viresh Kumar --- drivers/opp/of.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 1813f5ad5fa2..6dc41faf74b5 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -77,8 +77,6 @@ static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, { struct dev_pm_opp *opp; - lockdep_assert_held(&opp_table_lock); - mutex_lock(&opp_table->lock); list_for_each_entry(opp, &opp_table->opp_list, node) { From 77751a466ebd1a785456556061a2db6d60ea3898 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 16 Oct 2019 12:41:24 +0200 Subject: [PATCH 2/8] PM: QoS: Introduce frequency QoS Introduce frequency QoS, based on the "raw" low-level PM QoS, to represent min and max frequency requests and aggregate constraints. The min and max frequency requests are to be represented by struct freq_qos_request objects and the aggregate constraints are to be represented by struct freq_constraints objects. The latter are expected to be initialized with the help of freq_constraints_init(). The freq_qos_read_value() helper is defined to retrieve the aggregate constraints values from a given struct freq_constraints object and there are the freq_qos_add_request(), freq_qos_update_request() and freq_qos_remove_request() helpers to manipulate the min and max frequency requests. It is assumed that the the helpers will not run concurrently with each other for the same struct freq_qos_request object, so if that may be the case, their uses must ensure proper synchronization between them (e.g. through locking). In addition, freq_qos_add_notifier() and freq_qos_remove_notifier() are provided to add and remove notifiers that will trigger on aggregate constraint changes to and from a given struct freq_constraints object, respectively. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- include/linux/pm_qos.h | 44 ++++++++ kernel/power/qos.c | 240 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 284 insertions(+) diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 222c3e01397c..57b93e3d8f29 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -267,4 +267,48 @@ static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev) } #endif +#define FREQ_QOS_MIN_DEFAULT_VALUE 0 +#define FREQ_QOS_MAX_DEFAULT_VALUE (-1) + +enum freq_qos_req_type { + FREQ_QOS_MIN = 1, + FREQ_QOS_MAX, +}; + +struct freq_constraints { + struct pm_qos_constraints min_freq; + struct blocking_notifier_head min_freq_notifiers; + struct pm_qos_constraints max_freq; + struct blocking_notifier_head max_freq_notifiers; +}; + +struct freq_qos_request { + enum freq_qos_req_type type; + struct plist_node pnode; + struct freq_constraints *qos; +}; + +static inline int freq_qos_request_active(struct freq_qos_request *req) +{ + return !IS_ERR_OR_NULL(req->qos); +} + +void freq_constraints_init(struct freq_constraints *qos); + +s32 freq_qos_read_value(struct freq_constraints *qos, + enum freq_qos_req_type type); + +int freq_qos_add_request(struct freq_constraints *qos, + struct freq_qos_request *req, + enum freq_qos_req_type type, s32 value); +int freq_qos_update_request(struct freq_qos_request *req, s32 new_value); +int freq_qos_remove_request(struct freq_qos_request *req); + +int freq_qos_add_notifier(struct freq_constraints *qos, + enum freq_qos_req_type type, + struct notifier_block *notifier); +int freq_qos_remove_notifier(struct freq_constraints *qos, + enum freq_qos_req_type type, + struct notifier_block *notifier); + #endif diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 9568a2fe7c11..04e83fdfbe80 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -650,3 +650,243 @@ static int __init pm_qos_power_init(void) } late_initcall(pm_qos_power_init); + +/* Definitions related to the frequency QoS below. */ + +/** + * freq_constraints_init - Initialize frequency QoS constraints. + * @qos: Frequency QoS constraints to initialize. + */ +void freq_constraints_init(struct freq_constraints *qos) +{ + struct pm_qos_constraints *c; + + c = &qos->min_freq; + plist_head_init(&c->list); + c->target_value = FREQ_QOS_MIN_DEFAULT_VALUE; + c->default_value = FREQ_QOS_MIN_DEFAULT_VALUE; + c->no_constraint_value = FREQ_QOS_MIN_DEFAULT_VALUE; + c->type = PM_QOS_MAX; + c->notifiers = &qos->min_freq_notifiers; + BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers); + + c = &qos->max_freq; + plist_head_init(&c->list); + c->target_value = FREQ_QOS_MAX_DEFAULT_VALUE; + c->default_value = FREQ_QOS_MAX_DEFAULT_VALUE; + c->no_constraint_value = FREQ_QOS_MAX_DEFAULT_VALUE; + c->type = PM_QOS_MIN; + c->notifiers = &qos->max_freq_notifiers; + BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers); +} + +/** + * freq_qos_read_value - Get frequency QoS constraint for a given list. + * @qos: Constraints to evaluate. + * @type: QoS request type. + */ +s32 freq_qos_read_value(struct freq_constraints *qos, + enum freq_qos_req_type type) +{ + s32 ret; + + switch (type) { + case FREQ_QOS_MIN: + ret = IS_ERR_OR_NULL(qos) ? + FREQ_QOS_MIN_DEFAULT_VALUE : + pm_qos_read_value(&qos->min_freq); + break; + case FREQ_QOS_MAX: + ret = IS_ERR_OR_NULL(qos) ? + FREQ_QOS_MAX_DEFAULT_VALUE : + pm_qos_read_value(&qos->max_freq); + break; + default: + WARN_ON(1); + ret = 0; + } + + return ret; +} + +/** + * freq_qos_apply - Add/modify/remove frequency QoS request. + * @req: Constraint request to apply. + * @action: Action to perform (add/update/remove). + * @value: Value to assign to the QoS request. + */ +static int freq_qos_apply(struct freq_qos_request *req, + enum pm_qos_req_action action, s32 value) +{ + int ret; + + switch(req->type) { + case FREQ_QOS_MIN: + ret = pm_qos_update_target(&req->qos->min_freq, &req->pnode, + action, value); + break; + case FREQ_QOS_MAX: + ret = pm_qos_update_target(&req->qos->max_freq, &req->pnode, + action, value); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +/** + * freq_qos_add_request - Insert new frequency QoS request into a given list. + * @qos: Constraints to update. + * @req: Preallocated request object. + * @type: Request type. + * @value: Request value. + * + * Insert a new entry into the @qos list of requests, recompute the effective + * QoS constraint value for that list and initialize the @req object. The + * caller needs to save that object for later use in updates and removal. + * + * Return 1 if the effective constraint value has changed, 0 if the effective + * constraint value has not changed, or a negative error code on failures. + */ +int freq_qos_add_request(struct freq_constraints *qos, + struct freq_qos_request *req, + enum freq_qos_req_type type, s32 value) +{ + int ret; + + if (IS_ERR_OR_NULL(qos) || !req) + return -EINVAL; + + if (WARN(freq_qos_request_active(req), + "%s() called for active request\n", __func__)) + return -EINVAL; + + req->qos = qos; + req->type = type; + ret = freq_qos_apply(req, PM_QOS_ADD_REQ, value); + if (ret < 0) { + req->qos = NULL; + req->type = 0; + } + + return ret; +} +EXPORT_SYMBOL_GPL(freq_qos_add_request); + +/** + * freq_qos_update_request - Modify existing frequency QoS request. + * @req: Request to modify. + * @new_value: New request value. + * + * Update an existing frequency QoS request along with the effective constraint + * value for the list of requests it belongs to. + * + * Return 1 if the effective constraint value has changed, 0 if the effective + * constraint value has not changed, or a negative error code on failures. + */ +int freq_qos_update_request(struct freq_qos_request *req, s32 new_value) +{ + if (!req) + return -EINVAL; + + if (WARN(!freq_qos_request_active(req), + "%s() called for unknown object\n", __func__)) + return -EINVAL; + + if (req->pnode.prio == new_value) + return 0; + + return freq_qos_apply(req, PM_QOS_UPDATE_REQ, new_value); +} +EXPORT_SYMBOL_GPL(freq_qos_update_request); + +/** + * freq_qos_remove_request - Remove frequency QoS request from its list. + * @req: Request to remove. + * + * Remove the given frequency QoS request from the list of constraints it + * belongs to and recompute the effective constraint value for that list. + * + * Return 1 if the effective constraint value has changed, 0 if the effective + * constraint value has not changed, or a negative error code on failures. + */ +int freq_qos_remove_request(struct freq_qos_request *req) +{ + if (!req) + return -EINVAL; + + if (WARN(!freq_qos_request_active(req), + "%s() called for unknown object\n", __func__)) + return -EINVAL; + + return freq_qos_apply(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); +} +EXPORT_SYMBOL_GPL(freq_qos_remove_request); + +/** + * freq_qos_add_notifier - Add frequency QoS change notifier. + * @qos: List of requests to add the notifier to. + * @type: Request type. + * @notifier: Notifier block to add. + */ +int freq_qos_add_notifier(struct freq_constraints *qos, + enum freq_qos_req_type type, + struct notifier_block *notifier) +{ + int ret; + + if (IS_ERR_OR_NULL(qos) || !notifier) + return -EINVAL; + + switch (type) { + case FREQ_QOS_MIN: + ret = blocking_notifier_chain_register(qos->min_freq.notifiers, + notifier); + break; + case FREQ_QOS_MAX: + ret = blocking_notifier_chain_register(qos->max_freq.notifiers, + notifier); + break; + default: + WARN_ON(1); + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(freq_qos_add_notifier); + +/** + * freq_qos_remove_notifier - Remove frequency QoS change notifier. + * @qos: List of requests to remove the notifier from. + * @type: Request type. + * @notifier: Notifier block to remove. + */ +int freq_qos_remove_notifier(struct freq_constraints *qos, + enum freq_qos_req_type type, + struct notifier_block *notifier) +{ + int ret; + + if (IS_ERR_OR_NULL(qos) || !notifier) + return -EINVAL; + + switch (type) { + case FREQ_QOS_MIN: + ret = blocking_notifier_chain_unregister(qos->min_freq.notifiers, + notifier); + break; + case FREQ_QOS_MAX: + ret = blocking_notifier_chain_unregister(qos->max_freq.notifiers, + notifier); + break; + default: + WARN_ON(1); + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(freq_qos_remove_notifier); From 3000ce3c52f8b8db093e4dc649cd172390f71137 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 16 Oct 2019 12:47:06 +0200 Subject: [PATCH 3/8] cpufreq: Use per-policy frequency QoS Replace the CPU device PM QoS used for the management of min and max frequency constraints in cpufreq (and its users) with per-policy frequency QoS to avoid problems with cpufreq policies covering more then one CPU. Namely, a cpufreq driver is registered with the subsys interface which calls cpufreq_add_dev() for each CPU, starting from CPU0, so currently the PM QoS notifiers are added to the first CPU in the policy (i.e. CPU0 in the majority of cases). In turn, when the cpufreq driver is unregistered, the subsys interface doing that calls cpufreq_remove_dev() for each CPU, starting from CPU0, and the PM QoS notifiers are only removed when cpufreq_remove_dev() is called for the last CPU in the policy, say CPUx, which as a rule is not CPU0 if the policy covers more than one CPU. Then, the PM QoS notifiers cannot be removed, because CPUx does not have them, and they are still there in the device PM QoS notifiers list of CPU0, which prevents new PM QoS notifiers from being registered for CPU0 on the next attempt to register the cpufreq driver. The same issue occurs when the first CPU in the policy goes offline before unregistering the driver. After this change it does not matter which CPU is the policy CPU at the driver registration time and whether or not it is online all the time, because the frequency QoS is per policy and not per CPU. Fixes: 67d874c3b2c6 ("cpufreq: Register notifiers with the PM QoS framework") Reported-by: Dmitry Osipenko Tested-by: Dmitry Osipenko Reported-by: Sudeep Holla Tested-by: Sudeep Holla Diagnosed-by: Viresh Kumar Link: https://lore.kernel.org/linux-pm/5ad2624194baa2f53acc1f1e627eb7684c577a19.1562210705.git.viresh.kumar@linaro.org/T/#md2d89e95906b8c91c15f582146173dce2e86e99f Link: https://lore.kernel.org/linux-pm/20191017094612.6tbkwoq4harsjcqv@vireshk-i7/T/#m30d48cc23b9a80467fbaa16e30f90b3828a5a29b Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/acpi/processor_driver.c | 9 ++-- drivers/acpi/processor_perflib.c | 18 +++---- drivers/acpi/processor_thermal.c | 18 +++---- drivers/cpufreq/cpufreq.c | 59 ++++++++++------------ drivers/cpufreq/intel_pstate.c | 30 +++++------ drivers/cpufreq/ppc_cbe_cpufreq_pmi.c | 15 +++--- drivers/macintosh/windfarm_cpufreq_clamp.c | 38 ++++++++------ drivers/thermal/cpu_cooling.c | 14 ++--- include/acpi/processor.h | 20 ++++---- include/linux/cpufreq.h | 7 ++- 10 files changed, 114 insertions(+), 114 deletions(-) diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 08da9c29f1e9..62114a03a51a 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -290,14 +290,13 @@ static int acpi_processor_notifier(struct notifier_block *nb, unsigned long event, void *data) { struct cpufreq_policy *policy = data; - int cpu = policy->cpu; if (event == CPUFREQ_CREATE_POLICY) { - acpi_thermal_cpufreq_init(cpu); - acpi_processor_ppc_init(cpu); + acpi_thermal_cpufreq_init(policy); + acpi_processor_ppc_init(policy); } else if (event == CPUFREQ_REMOVE_POLICY) { - acpi_processor_ppc_exit(cpu); - acpi_thermal_cpufreq_exit(cpu); + acpi_processor_ppc_exit(policy); + acpi_thermal_cpufreq_exit(policy); } return 0; diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index 930a49fa4dfc..753e171de006 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -81,10 +81,10 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) pr->performance_platform_limit = (int)ppc; if (ppc >= pr->performance->state_count || - unlikely(!dev_pm_qos_request_active(&pr->perflib_req))) + unlikely(!freq_qos_request_active(&pr->perflib_req))) return 0; - ret = dev_pm_qos_update_request(&pr->perflib_req, + ret = freq_qos_update_request(&pr->perflib_req, pr->performance->states[ppc].core_frequency * 1000); if (ret < 0) { pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n", @@ -157,28 +157,28 @@ void acpi_processor_ignore_ppc_init(void) ignore_ppc = 0; } -void acpi_processor_ppc_init(int cpu) +void acpi_processor_ppc_init(struct cpufreq_policy *policy) { + int cpu = policy->cpu; struct acpi_processor *pr = per_cpu(processors, cpu); int ret; if (!pr) return; - ret = dev_pm_qos_add_request(get_cpu_device(cpu), - &pr->perflib_req, DEV_PM_QOS_MAX_FREQUENCY, - INT_MAX); + ret = freq_qos_add_request(&policy->constraints, &pr->perflib_req, + FREQ_QOS_MAX, INT_MAX); if (ret < 0) pr_err("Failed to add freq constraint for CPU%d (%d)\n", cpu, ret); } -void acpi_processor_ppc_exit(int cpu) +void acpi_processor_ppc_exit(struct cpufreq_policy *policy) { - struct acpi_processor *pr = per_cpu(processors, cpu); + struct acpi_processor *pr = per_cpu(processors, policy->cpu); if (pr) - dev_pm_qos_remove_request(&pr->perflib_req); + freq_qos_remove_request(&pr->perflib_req); } static int acpi_processor_get_performance_control(struct acpi_processor *pr) diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c index 8227c7dd75b1..c77a5b1fb107 100644 --- a/drivers/acpi/processor_thermal.c +++ b/drivers/acpi/processor_thermal.c @@ -105,7 +105,7 @@ static int cpufreq_set_cur_state(unsigned int cpu, int state) pr = per_cpu(processors, i); - if (unlikely(!dev_pm_qos_request_active(&pr->thermal_req))) + if (unlikely(!freq_qos_request_active(&pr->thermal_req))) continue; policy = cpufreq_cpu_get(i); @@ -116,7 +116,7 @@ static int cpufreq_set_cur_state(unsigned int cpu, int state) cpufreq_cpu_put(policy); - ret = dev_pm_qos_update_request(&pr->thermal_req, max_freq); + ret = freq_qos_update_request(&pr->thermal_req, max_freq); if (ret < 0) { pr_warn("Failed to update thermal freq constraint: CPU%d (%d)\n", pr->id, ret); @@ -125,28 +125,28 @@ static int cpufreq_set_cur_state(unsigned int cpu, int state) return 0; } -void acpi_thermal_cpufreq_init(int cpu) +void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy) { + int cpu = policy->cpu; struct acpi_processor *pr = per_cpu(processors, cpu); int ret; if (!pr) return; - ret = dev_pm_qos_add_request(get_cpu_device(cpu), - &pr->thermal_req, DEV_PM_QOS_MAX_FREQUENCY, - INT_MAX); + ret = freq_qos_add_request(&policy->constraints, &pr->thermal_req, + FREQ_QOS_MAX, INT_MAX); if (ret < 0) pr_err("Failed to add freq constraint for CPU%d (%d)\n", cpu, ret); } -void acpi_thermal_cpufreq_exit(int cpu) +void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy) { - struct acpi_processor *pr = per_cpu(processors, cpu); + struct acpi_processor *pr = per_cpu(processors, policy->cpu); if (pr) - dev_pm_qos_remove_request(&pr->thermal_req); + freq_qos_remove_request(&pr->thermal_req); } #else /* ! CONFIG_CPU_FREQ */ static int cpufreq_get_max_state(unsigned int cpu) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index bffc11b87247..8478ff6f3045 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -720,7 +720,7 @@ static ssize_t store_##file_name \ if (ret != 1) \ return -EINVAL; \ \ - ret = dev_pm_qos_update_request(policy->object##_freq_req, val);\ + ret = freq_qos_update_request(policy->object##_freq_req, val);\ return ret >= 0 ? count : ret; \ } @@ -1202,19 +1202,21 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) goto err_free_real_cpus; } + freq_constraints_init(&policy->constraints); + policy->nb_min.notifier_call = cpufreq_notifier_min; policy->nb_max.notifier_call = cpufreq_notifier_max; - ret = dev_pm_qos_add_notifier(dev, &policy->nb_min, - DEV_PM_QOS_MIN_FREQUENCY); + ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN, + &policy->nb_min); if (ret) { dev_err(dev, "Failed to register MIN QoS notifier: %d (%*pbl)\n", ret, cpumask_pr_args(policy->cpus)); goto err_kobj_remove; } - ret = dev_pm_qos_add_notifier(dev, &policy->nb_max, - DEV_PM_QOS_MAX_FREQUENCY); + ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX, + &policy->nb_max); if (ret) { dev_err(dev, "Failed to register MAX QoS notifier: %d (%*pbl)\n", ret, cpumask_pr_args(policy->cpus)); @@ -1232,8 +1234,8 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) return policy; err_min_qos_notifier: - dev_pm_qos_remove_notifier(dev, &policy->nb_min, - DEV_PM_QOS_MIN_FREQUENCY); + freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, + &policy->nb_min); err_kobj_remove: cpufreq_policy_put_kobj(policy); err_free_real_cpus: @@ -1250,7 +1252,6 @@ err_free_policy: static void cpufreq_policy_free(struct cpufreq_policy *policy) { - struct device *dev = get_cpu_device(policy->cpu); unsigned long flags; int cpu; @@ -1262,10 +1263,10 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy) per_cpu(cpufreq_cpu_data, cpu) = NULL; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - dev_pm_qos_remove_notifier(dev, &policy->nb_max, - DEV_PM_QOS_MAX_FREQUENCY); - dev_pm_qos_remove_notifier(dev, &policy->nb_min, - DEV_PM_QOS_MIN_FREQUENCY); + freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX, + &policy->nb_max); + freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, + &policy->nb_min); if (policy->max_freq_req) { /* @@ -1274,10 +1275,10 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy) */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_REMOVE_POLICY, policy); - dev_pm_qos_remove_request(policy->max_freq_req); + freq_qos_remove_request(policy->max_freq_req); } - dev_pm_qos_remove_request(policy->min_freq_req); + freq_qos_remove_request(policy->min_freq_req); kfree(policy->min_freq_req); cpufreq_policy_put_kobj(policy); @@ -1357,8 +1358,6 @@ static int cpufreq_online(unsigned int cpu) cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); if (new_policy) { - struct device *dev = get_cpu_device(cpu); - for_each_cpu(j, policy->related_cpus) { per_cpu(cpufreq_cpu_data, j) = policy; add_cpu_dev_symlink(policy, j); @@ -1369,36 +1368,31 @@ static int cpufreq_online(unsigned int cpu) if (!policy->min_freq_req) goto out_destroy_policy; - ret = dev_pm_qos_add_request(dev, policy->min_freq_req, - DEV_PM_QOS_MIN_FREQUENCY, - policy->min); + ret = freq_qos_add_request(&policy->constraints, + policy->min_freq_req, FREQ_QOS_MIN, + policy->min); if (ret < 0) { /* - * So we don't call dev_pm_qos_remove_request() for an + * So we don't call freq_qos_remove_request() for an * uninitialized request. */ kfree(policy->min_freq_req); policy->min_freq_req = NULL; - - dev_err(dev, "Failed to add min-freq constraint (%d)\n", - ret); goto out_destroy_policy; } /* * This must be initialized right here to avoid calling - * dev_pm_qos_remove_request() on uninitialized request in case + * freq_qos_remove_request() on uninitialized request in case * of errors. */ policy->max_freq_req = policy->min_freq_req + 1; - ret = dev_pm_qos_add_request(dev, policy->max_freq_req, - DEV_PM_QOS_MAX_FREQUENCY, - policy->max); + ret = freq_qos_add_request(&policy->constraints, + policy->max_freq_req, FREQ_QOS_MAX, + policy->max); if (ret < 0) { policy->max_freq_req = NULL; - dev_err(dev, "Failed to add max-freq constraint (%d)\n", - ret); goto out_destroy_policy; } @@ -2374,7 +2368,6 @@ int cpufreq_set_policy(struct cpufreq_policy *policy, struct cpufreq_policy *new_policy) { struct cpufreq_governor *old_gov; - struct device *cpu_dev = get_cpu_device(policy->cpu); int ret; pr_debug("setting new policy for CPU %u: %u - %u kHz\n", @@ -2386,8 +2379,8 @@ int cpufreq_set_policy(struct cpufreq_policy *policy, * PM QoS framework collects all the requests from users and provide us * the final aggregated value here. */ - new_policy->min = dev_pm_qos_read_value(cpu_dev, DEV_PM_QOS_MIN_FREQUENCY); - new_policy->max = dev_pm_qos_read_value(cpu_dev, DEV_PM_QOS_MAX_FREQUENCY); + new_policy->min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN); + new_policy->max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX); /* verify the cpu speed can be set within this limit */ ret = cpufreq_driver->verify(new_policy); @@ -2518,7 +2511,7 @@ static int cpufreq_boost_set_sw(int state) break; } - ret = dev_pm_qos_update_request(policy->max_freq_req, policy->max); + ret = freq_qos_update_request(policy->max_freq_req, policy->max); if (ret < 0) break; } diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 9f02de9a1b47..53a51c169451 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1088,10 +1088,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b, static struct cpufreq_driver intel_pstate; -static void update_qos_request(enum dev_pm_qos_req_type type) +static void update_qos_request(enum freq_qos_req_type type) { int max_state, turbo_max, freq, i, perf_pct; - struct dev_pm_qos_request *req; + struct freq_qos_request *req; struct cpufreq_policy *policy; for_each_possible_cpu(i) { @@ -1112,7 +1112,7 @@ static void update_qos_request(enum dev_pm_qos_req_type type) else turbo_max = cpu->pstate.turbo_pstate; - if (type == DEV_PM_QOS_MIN_FREQUENCY) { + if (type == FREQ_QOS_MIN) { perf_pct = global.min_perf_pct; } else { req++; @@ -1122,7 +1122,7 @@ static void update_qos_request(enum dev_pm_qos_req_type type) freq = DIV_ROUND_UP(turbo_max * perf_pct, 100); freq *= cpu->pstate.scaling; - if (dev_pm_qos_update_request(req, freq) < 0) + if (freq_qos_update_request(req, freq) < 0) pr_warn("Failed to update freq constraint: CPU%d\n", i); } } @@ -1153,7 +1153,7 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b, if (intel_pstate_driver == &intel_pstate) intel_pstate_update_policies(); else - update_qos_request(DEV_PM_QOS_MAX_FREQUENCY); + update_qos_request(FREQ_QOS_MAX); mutex_unlock(&intel_pstate_driver_lock); @@ -1187,7 +1187,7 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b, if (intel_pstate_driver == &intel_pstate) intel_pstate_update_policies(); else - update_qos_request(DEV_PM_QOS_MIN_FREQUENCY); + update_qos_request(FREQ_QOS_MIN); mutex_unlock(&intel_pstate_driver_lock); @@ -2381,7 +2381,7 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy, static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) { int max_state, turbo_max, min_freq, max_freq, ret; - struct dev_pm_qos_request *req; + struct freq_qos_request *req; struct cpudata *cpu; struct device *dev; @@ -2416,15 +2416,15 @@ static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) max_freq = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100); max_freq *= cpu->pstate.scaling; - ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_MIN_FREQUENCY, - min_freq); + ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN, + min_freq); if (ret < 0) { dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret); goto free_req; } - ret = dev_pm_qos_add_request(dev, req + 1, DEV_PM_QOS_MAX_FREQUENCY, - max_freq); + ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX, + max_freq); if (ret < 0) { dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret); goto remove_min_req; @@ -2435,7 +2435,7 @@ static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) return 0; remove_min_req: - dev_pm_qos_remove_request(req); + freq_qos_remove_request(req); free_req: kfree(req); pstate_exit: @@ -2446,12 +2446,12 @@ pstate_exit: static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy) { - struct dev_pm_qos_request *req; + struct freq_qos_request *req; req = policy->driver_data; - dev_pm_qos_remove_request(req + 1); - dev_pm_qos_remove_request(req); + freq_qos_remove_request(req + 1); + freq_qos_remove_request(req); kfree(req); return intel_pstate_cpu_exit(policy); diff --git a/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c index bc9dd30395c4..037fe23bc6ed 100644 --- a/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c +++ b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c @@ -65,7 +65,7 @@ EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi); static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg) { struct cpufreq_policy *policy; - struct dev_pm_qos_request *req; + struct freq_qos_request *req; u8 node, slow_mode; int cpu, ret; @@ -86,7 +86,7 @@ static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg) req = policy->driver_data; - ret = dev_pm_qos_update_request(req, + ret = freq_qos_update_request(req, policy->freq_table[slow_mode].frequency); if (ret < 0) pr_warn("Failed to update freq constraint: %d\n", ret); @@ -103,7 +103,7 @@ static struct pmi_handler cbe_pmi_handler = { void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy) { - struct dev_pm_qos_request *req; + struct freq_qos_request *req; int ret; if (!cbe_cpufreq_has_pmi) @@ -113,9 +113,8 @@ void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy) if (!req) return; - ret = dev_pm_qos_add_request(get_cpu_device(policy->cpu), req, - DEV_PM_QOS_MAX_FREQUENCY, - policy->freq_table[0].frequency); + ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MAX, + policy->freq_table[0].frequency); if (ret < 0) { pr_err("Failed to add freq constraint (%d)\n", ret); kfree(req); @@ -128,10 +127,10 @@ EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init); void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy) { - struct dev_pm_qos_request *req = policy->driver_data; + struct freq_qos_request *req = policy->driver_data; if (cbe_cpufreq_has_pmi) { - dev_pm_qos_remove_request(req); + freq_qos_remove_request(req); kfree(req); } } diff --git a/drivers/macintosh/windfarm_cpufreq_clamp.c b/drivers/macintosh/windfarm_cpufreq_clamp.c index 705c6200814b..7b726f00f183 100644 --- a/drivers/macintosh/windfarm_cpufreq_clamp.c +++ b/drivers/macintosh/windfarm_cpufreq_clamp.c @@ -18,7 +18,7 @@ static int clamped; static struct wf_control *clamp_control; -static struct dev_pm_qos_request qos_req; +static struct freq_qos_request qos_req; static unsigned int min_freq, max_freq; static int clamp_set(struct wf_control *ct, s32 value) @@ -35,7 +35,7 @@ static int clamp_set(struct wf_control *ct, s32 value) } clamped = value; - return dev_pm_qos_update_request(&qos_req, freq); + return freq_qos_update_request(&qos_req, freq); } static int clamp_get(struct wf_control *ct, s32 *value) @@ -77,38 +77,44 @@ static int __init wf_cpufreq_clamp_init(void) min_freq = policy->cpuinfo.min_freq; max_freq = policy->cpuinfo.max_freq; + + ret = freq_qos_add_request(&policy->constraints, &qos_req, FREQ_QOS_MAX, + max_freq); + cpufreq_cpu_put(policy); + if (ret < 0) { + pr_err("%s: Failed to add freq constraint (%d)\n", __func__, + ret); + return ret; + } + dev = get_cpu_device(0); if (unlikely(!dev)) { pr_warn("%s: No cpu device for cpu0\n", __func__); - return -ENODEV; + ret = -ENODEV; + goto fail; } clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL); - if (clamp == NULL) - return -ENOMEM; - - ret = dev_pm_qos_add_request(dev, &qos_req, DEV_PM_QOS_MAX_FREQUENCY, - max_freq); - if (ret < 0) { - pr_err("%s: Failed to add freq constraint (%d)\n", __func__, - ret); - goto free; + if (clamp == NULL) { + ret = -ENOMEM; + goto fail; } clamp->ops = &clamp_ops; clamp->name = "cpufreq-clamp"; ret = wf_register_control(clamp); if (ret) - goto fail; + goto free; + clamp_control = clamp; return 0; - fail: - dev_pm_qos_remove_request(&qos_req); free: kfree(clamp); + fail: + freq_qos_remove_request(&qos_req); return ret; } @@ -116,7 +122,7 @@ static void __exit wf_cpufreq_clamp_exit(void) { if (clamp_control) { wf_unregister_control(clamp_control); - dev_pm_qos_remove_request(&qos_req); + freq_qos_remove_request(&qos_req); } } diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index 391f39776c6a..6b9865c786ba 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -88,7 +88,7 @@ struct cpufreq_cooling_device { struct cpufreq_policy *policy; struct list_head node; struct time_in_idle *idle_time; - struct dev_pm_qos_request qos_req; + struct freq_qos_request qos_req; }; static DEFINE_IDA(cpufreq_ida); @@ -331,7 +331,7 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, cpufreq_cdev->cpufreq_state = state; - return dev_pm_qos_update_request(&cpufreq_cdev->qos_req, + return freq_qos_update_request(&cpufreq_cdev->qos_req, cpufreq_cdev->freq_table[state].frequency); } @@ -615,9 +615,9 @@ __cpufreq_cooling_register(struct device_node *np, cooling_ops = &cpufreq_cooling_ops; } - ret = dev_pm_qos_add_request(dev, &cpufreq_cdev->qos_req, - DEV_PM_QOS_MAX_FREQUENCY, - cpufreq_cdev->freq_table[0].frequency); + ret = freq_qos_add_request(&policy->constraints, + &cpufreq_cdev->qos_req, FREQ_QOS_MAX, + cpufreq_cdev->freq_table[0].frequency); if (ret < 0) { pr_err("%s: Failed to add freq constraint (%d)\n", __func__, ret); @@ -637,7 +637,7 @@ __cpufreq_cooling_register(struct device_node *np, return cdev; remove_qos_req: - dev_pm_qos_remove_request(&cpufreq_cdev->qos_req); + freq_qos_remove_request(&cpufreq_cdev->qos_req); remove_ida: ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); free_table: @@ -736,7 +736,7 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) mutex_unlock(&cooling_list_lock); thermal_cooling_device_unregister(cdev); - dev_pm_qos_remove_request(&cpufreq_cdev->qos_req); + freq_qos_remove_request(&cpufreq_cdev->qos_req); ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); kfree(cpufreq_cdev->idle_time); kfree(cpufreq_cdev->freq_table); diff --git a/include/acpi/processor.h b/include/acpi/processor.h index f936033cb9e6..47805172e73d 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -232,8 +232,8 @@ struct acpi_processor { struct acpi_processor_limit limit; struct thermal_cooling_device *cdev; struct device *dev; /* Processor device. */ - struct dev_pm_qos_request perflib_req; - struct dev_pm_qos_request thermal_req; + struct freq_qos_request perflib_req; + struct freq_qos_request thermal_req; }; struct acpi_processor_errata { @@ -302,8 +302,8 @@ static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx #ifdef CONFIG_CPU_FREQ extern bool acpi_processor_cpufreq_init; void acpi_processor_ignore_ppc_init(void); -void acpi_processor_ppc_init(int cpu); -void acpi_processor_ppc_exit(int cpu); +void acpi_processor_ppc_init(struct cpufreq_policy *policy); +void acpi_processor_ppc_exit(struct cpufreq_policy *policy); void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag); extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit); #else @@ -311,11 +311,11 @@ static inline void acpi_processor_ignore_ppc_init(void) { return; } -static inline void acpi_processor_ppc_init(int cpu) +static inline void acpi_processor_ppc_init(struct cpufreq_policy *policy) { return; } -static inline void acpi_processor_ppc_exit(int cpu) +static inline void acpi_processor_ppc_exit(struct cpufreq_policy *policy) { return; } @@ -431,14 +431,14 @@ static inline int acpi_processor_hotplug(struct acpi_processor *pr) int acpi_processor_get_limit_info(struct acpi_processor *pr); extern const struct thermal_cooling_device_ops processor_cooling_ops; #if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ) -void acpi_thermal_cpufreq_init(int cpu); -void acpi_thermal_cpufreq_exit(int cpu); +void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy); +void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy); #else -static inline void acpi_thermal_cpufreq_init(int cpu) +static inline void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy) { return; } -static inline void acpi_thermal_cpufreq_exit(int cpu) +static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy) { return; } diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index c57e88e85c41..92d5fdc8154e 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -76,8 +77,10 @@ struct cpufreq_policy { struct work_struct update; /* if update_policy() needs to be * called, but you're in IRQ context */ - struct dev_pm_qos_request *min_freq_req; - struct dev_pm_qos_request *max_freq_req; + struct freq_constraints constraints; + struct freq_qos_request *min_freq_req; + struct freq_qos_request *max_freq_req; + struct cpufreq_frequency_table *freq_table; enum cpufreq_table_sorting freq_table_sorted; From 2aac8bdf7a0fbd3e2a34141d28b57a7e21482cf7 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 16 Oct 2019 12:47:53 +0200 Subject: [PATCH 4/8] PM: QoS: Drop frequency QoS types from device PM QoS There are no more active users of DEV_PM_QOS_MIN_FREQUENCY and DEV_PM_QOS_MAX_FREQUENCY device PM QoS request types, so drop them along with the code supporting them. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/base/power/qos.c | 70 ++-------------------------------------- include/linux/pm_qos.h | 12 ------- 2 files changed, 2 insertions(+), 80 deletions(-) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 6c90fd7e2ff8..350dcafd751f 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -115,20 +115,10 @@ s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type) spin_lock_irqsave(&dev->power.lock, flags); - switch (type) { - case DEV_PM_QOS_RESUME_LATENCY: + if (type == DEV_PM_QOS_RESUME_LATENCY) { ret = IS_ERR_OR_NULL(qos) ? PM_QOS_RESUME_LATENCY_NO_CONSTRAINT : pm_qos_read_value(&qos->resume_latency); - break; - case DEV_PM_QOS_MIN_FREQUENCY: - ret = IS_ERR_OR_NULL(qos) ? PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE - : pm_qos_read_value(&qos->min_frequency); - break; - case DEV_PM_QOS_MAX_FREQUENCY: - ret = IS_ERR_OR_NULL(qos) ? PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE - : pm_qos_read_value(&qos->max_frequency); - break; - default: + } else { WARN_ON(1); ret = 0; } @@ -169,14 +159,6 @@ static int apply_constraint(struct dev_pm_qos_request *req, req->dev->power.set_latency_tolerance(req->dev, value); } break; - case DEV_PM_QOS_MIN_FREQUENCY: - ret = pm_qos_update_target(&qos->min_frequency, - &req->data.pnode, action, value); - break; - case DEV_PM_QOS_MAX_FREQUENCY: - ret = pm_qos_update_target(&qos->max_frequency, - &req->data.pnode, action, value); - break; case DEV_PM_QOS_FLAGS: ret = pm_qos_update_flags(&qos->flags, &req->data.flr, action, value); @@ -227,24 +209,6 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) c->no_constraint_value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; c->type = PM_QOS_MIN; - c = &qos->min_frequency; - plist_head_init(&c->list); - c->target_value = PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE; - c->default_value = PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE; - c->no_constraint_value = PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE; - c->type = PM_QOS_MAX; - c->notifiers = ++n; - BLOCKING_INIT_NOTIFIER_HEAD(n); - - c = &qos->max_frequency; - plist_head_init(&c->list); - c->target_value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; - c->default_value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; - c->no_constraint_value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; - c->type = PM_QOS_MIN; - c->notifiers = ++n; - BLOCKING_INIT_NOTIFIER_HEAD(n); - INIT_LIST_HEAD(&qos->flags.list); spin_lock_irq(&dev->power.lock); @@ -305,18 +269,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev) memset(req, 0, sizeof(*req)); } - c = &qos->min_frequency; - plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { - apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE); - memset(req, 0, sizeof(*req)); - } - - c = &qos->max_frequency; - plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { - apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); - memset(req, 0, sizeof(*req)); - } - f = &qos->flags; list_for_each_entry_safe(req, tmp, &f->list, data.flr.node) { apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); @@ -428,8 +380,6 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, switch(req->type) { case DEV_PM_QOS_RESUME_LATENCY: case DEV_PM_QOS_LATENCY_TOLERANCE: - case DEV_PM_QOS_MIN_FREQUENCY: - case DEV_PM_QOS_MAX_FREQUENCY: curr_value = req->data.pnode.prio; break; case DEV_PM_QOS_FLAGS: @@ -557,14 +507,6 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier, ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers, notifier); break; - case DEV_PM_QOS_MIN_FREQUENCY: - ret = blocking_notifier_chain_register(dev->power.qos->min_frequency.notifiers, - notifier); - break; - case DEV_PM_QOS_MAX_FREQUENCY: - ret = blocking_notifier_chain_register(dev->power.qos->max_frequency.notifiers, - notifier); - break; default: WARN_ON(1); ret = -EINVAL; @@ -604,14 +546,6 @@ int dev_pm_qos_remove_notifier(struct device *dev, ret = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers, notifier); break; - case DEV_PM_QOS_MIN_FREQUENCY: - ret = blocking_notifier_chain_unregister(dev->power.qos->min_frequency.notifiers, - notifier); - break; - case DEV_PM_QOS_MAX_FREQUENCY: - ret = blocking_notifier_chain_unregister(dev->power.qos->max_frequency.notifiers, - notifier); - break; default: WARN_ON(1); ret = -EINVAL; diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 57b93e3d8f29..ebf5ef17cc2a 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -34,8 +34,6 @@ enum pm_qos_flags_status { #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0 -#define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE 0 -#define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE (-1) #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1) #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0) @@ -54,8 +52,6 @@ struct pm_qos_flags_request { enum dev_pm_qos_req_type { DEV_PM_QOS_RESUME_LATENCY = 1, DEV_PM_QOS_LATENCY_TOLERANCE, - DEV_PM_QOS_MIN_FREQUENCY, - DEV_PM_QOS_MAX_FREQUENCY, DEV_PM_QOS_FLAGS, }; @@ -97,14 +93,10 @@ struct pm_qos_flags { struct dev_pm_qos { struct pm_qos_constraints resume_latency; struct pm_qos_constraints latency_tolerance; - struct pm_qos_constraints min_frequency; - struct pm_qos_constraints max_frequency; struct pm_qos_flags flags; struct dev_pm_qos_request *resume_latency_req; struct dev_pm_qos_request *latency_tolerance_req; struct dev_pm_qos_request *flags_req; - struct dev_pm_qos_request *min_frequency_req; - struct dev_pm_qos_request *max_frequency_req; }; /* Action requested to pm_qos_update_target */ @@ -199,10 +191,6 @@ static inline s32 dev_pm_qos_read_value(struct device *dev, switch (type) { case DEV_PM_QOS_RESUME_LATENCY: return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; - case DEV_PM_QOS_MIN_FREQUENCY: - return PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE; - case DEV_PM_QOS_MAX_FREQUENCY: - return PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; default: WARN_ON(1); return 0; From 24957db1004353346583c9cc6d783db8f213e3ad Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 17 Oct 2019 12:27:58 +0200 Subject: [PATCH 5/8] opp: core: Revert "add regulators enable and disable" All the drivers, which use the OPP framework control regulators, which are already enabled. Typically those regulators are also system critical, due to providing power to CPU core or system buses. It turned out that there are cases, where calling regulator_enable() on such boot-enabled regulator has side-effects and might change its initial voltage due to performing initial voltage balancing without all restrictions from the consumers. Until this issue becomes finally solved in regulator core, avoid calling regulator_enable()/disable() from the OPP framework. This reverts commit 7f93ff73f7c8c8bfa6be33bcc16470b0b44682aa. Signed-off-by: Marek Szyprowski Reviewed-by: Mark Brown Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 3b7ffd0234e9..9ff0538ee83a 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1626,12 +1626,6 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, goto free_regulators; } - ret = regulator_enable(reg); - if (ret < 0) { - regulator_put(reg); - goto free_regulators; - } - opp_table->regulators[i] = reg; } @@ -1645,10 +1639,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, return opp_table; free_regulators: - while (i--) { - regulator_disable(opp_table->regulators[i]); - regulator_put(opp_table->regulators[i]); - } + while (i != 0) + regulator_put(opp_table->regulators[--i]); kfree(opp_table->regulators); opp_table->regulators = NULL; @@ -1674,10 +1666,8 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - for (i = opp_table->regulator_count - 1; i >= 0; i--) { - regulator_disable(opp_table->regulators[i]); + for (i = opp_table->regulator_count - 1; i >= 0; i--) regulator_put(opp_table->regulators[i]); - } _free_set_opp_data(opp_table); From 31d851407f90076c58291fb5eadc82c1dd613cee Mon Sep 17 00:00:00 2001 From: Zhenzhong Duan Date: Fri, 18 Oct 2019 08:49:29 +0800 Subject: [PATCH 6/8] cpuidle: haltpoll: Take 'idle=' override into account Currenly haltpoll isn't aware of the 'idle=' override, the priority is 'idle=poll' > haltpoll > 'idle=halt'. When 'idle=poll' is used, cpuidle driver is bypassed but current_driver in sys still shows 'haltpoll'. When 'idle=halt' is used, haltpoll takes precedence and makes 'idle=halt' have no effect. Add a check to prevent the haltpoll driver from loading if 'idle=' is present. Signed-off-by: Zhenzhong Duan Co-developed-by: Joao Martins [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki --- drivers/cpuidle/cpuidle-haltpoll.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c index 932390b028f1..b0ce9bc78113 100644 --- a/drivers/cpuidle/cpuidle-haltpoll.c +++ b/drivers/cpuidle/cpuidle-haltpoll.c @@ -95,6 +95,10 @@ static int __init haltpoll_init(void) int ret; struct cpuidle_driver *drv = &haltpoll_driver; + /* Do not load haltpoll if idle= is passed */ + if (boot_option_idle_override != IDLE_NO_OVERRIDE) + return -ENODEV; + cpuidle_poll_state_init(drv); if (!kvm_para_available() || From 6941051d3028963c3b0b3fcdd0815f2b51b957bb Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Fri, 18 Oct 2019 11:58:15 +0100 Subject: [PATCH 7/8] cpufreq: Cancel policy update work scheduled before freeing Scheduled policy update work may end up racing with the freeing of the policy and unregistering the driver. One possible race is as below, where the cpufreq_driver is unregistered, but the scheduled work gets executed at later stage when, cpufreq_driver is NULL (i.e. after freeing the policy and driver). Unable to handle kernel NULL pointer dereference at virtual address 0000001c pgd = (ptrval) [0000001c] *pgd=80000080204003, *pmd=00000000 Internal error: Oops: 206 [#1] SMP THUMB2 Modules linked in: CPU: 0 PID: 34 Comm: kworker/0:1 Not tainted 5.4.0-rc3-00006-g67f5a8081a4b #86 Hardware name: ARM-Versatile Express Workqueue: events handle_update PC is at cpufreq_set_policy+0x58/0x228 LR is at dev_pm_qos_read_value+0x77/0xac Control: 70c5387d Table: 80203000 DAC: fffffffd Process kworker/0:1 (pid: 34, stack limit = 0x(ptrval)) (cpufreq_set_policy) from (refresh_frequency_limits.part.24+0x37/0x48) (refresh_frequency_limits.part.24) from (handle_update+0x2f/0x38) (handle_update) from (process_one_work+0x16d/0x3cc) (process_one_work) from (worker_thread+0xff/0x414) (worker_thread) from (kthread+0xff/0x100) (kthread) from (ret_from_fork+0x11/0x28) Fixes: 67d874c3b2c6 ("cpufreq: Register notifiers with the PM QoS framework") Signed-off-by: Sudeep Holla [ rjw: Cancel the work before dropping the QoS requests ] Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 8478ff6f3045..48a224a6b178 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1268,6 +1268,9 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy) freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, &policy->nb_min); + /* Cancel any pending policy->update work before freeing the policy. */ + cancel_work_sync(&policy->update); + if (policy->max_freq_req) { /* * CPUFREQ_CREATE_POLICY notification is sent only after From b19c23551be8de0d4e59fe6af70f10763e3cc595 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Fri, 18 Oct 2019 14:11:58 +0530 Subject: [PATCH 8/8] opp: Reinitialize the list_kref before adding the static OPPs again The list_kref reaches a count of 0 when all the static OPPs are removed, for example when dev_pm_opp_of_cpumask_remove_table() is called, though the actual OPP table may not get freed as it may still be referenced by other parts of the kernel, like from a call to dev_pm_opp_set_supported_hw(). And if we call dev_pm_opp_of_cpumask_add_table() again at this point, we must reinitialize the list_kref otherwise the kernel will hit a WARN() in kref infrastructure for incrementing a kref with value 0. Fixes: 11e1a1648298 ("opp: Don't decrement uninitialized list_kref") Reported-by: Dmitry Osipenko Tested-by: Dmitry Osipenko Signed-off-by: Viresh Kumar --- drivers/opp/of.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 6dc41faf74b5..1cbb58240b80 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -663,6 +663,13 @@ static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table) return 0; } + /* + * Re-initialize list_kref every time we add static OPPs to the OPP + * table as the reference count may be 0 after the last tie static OPPs + * were removed. + */ + kref_init(&opp_table->list_kref); + /* We have opp-table node now, iterate over it and add OPPs */ for_each_available_child_of_node(opp_table->np, np) { opp = _opp_add_static_v2(opp_table, dev, np);